AAPG/Databases provides article, journal, and ebook collections, and conference presentations from the American Association of Petroleum Geologists. Content provided in PDF and HTML formats. 1935-present.

The ACS Symposium Series provides full text ebooks (each chapter is a separate HTML page or PDF) covering agriculture, food chemistry, organic and polymer chemistry, and chemical education topics. Each book is peer-reviewed. 1974-present.

ARTFL-FRANTEXT provides HTML full-text works ranging from classic French literature to various kinds of non-fiction prose and technical writing. The eighteenth, nineteenth, and twentieth centuries are about equally represented, with a smaller selection of seventeenth century texts as well as some medieval and Renaissance texts.

Acta Horticulturae provides the full text (PDF) of conference proceedings and technical reports from this peer-reviewed series of publications from the International Society of Horticultural Science. Content is searchable and browsable by publication year. 1963-present.

AnimalBase provides copyright-free open access to zoological works and provides manually verified lists of names of zoological genera and species. It includes digitized books and journal articles, most from prior to 1900, in their original language. Documents display as scanned images; many can be downloaded as PDFs. You can also search or browse by species, genus, or family. 350 BCE-present.

Art & Architecture Complete indexes citations, abstracts, and some full text from journals, magazines, trade publications, and books covering all aspects of art and architecture. It also includes a large image collection. 1901-present.